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From:   Souptick Joarder <jrdr.linux@gmail.com>
Date:   Mon, 22 Oct 2018 13:51:35 +0530
Message-ID: <CAFqt6zaaEWb-vQ6BVhYg1GgsxwKX=4H661OHU3Qfbk0FD3Cz9g@mail.gmail.com>
Subject: Re: [PATCH] drm/rcar-du: Convert drm_atomic_helper_suspend/resume()
To:     noralf@tronnes.org,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Gustavo Padovan <gustavo@padovan.org>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        sean@poorly.run, airlied@linux.ie, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Cc:     Daniel Vetter <daniel@ffwll.ch>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Laurent,

On Thu, Oct 11, 2018 at 1:48 PM Daniel Vetter <daniel@ffwll.ch> wrote:
>
> On Mon, Oct 08, 2018 at 09:57:52PM +0530, Souptick Joarder wrote:
> > Hi Laurent,
> > On Mon, Oct 1, 2018 at 6:12 PM Noralf Tr=C3=B8nnes <noralf@tronnes.org>=
 wrote:
> > >
> > >
> > > Den 01.10.2018 13.56, skrev Laurent Pinchart:
> > > > Hi Daniel,
> > > >
> > > > On Monday, 1 October 2018 09:52:20 EEST Daniel Vetter wrote:
> > > >> On Fri, Sep 28, 2018 at 06:30:35PM +0300, Laurent Pinchart wrote:
> > > >>> On Friday, 28 September 2018 18:05:18 EEST Laurent Pinchart wrote=
:
> > > >>>> On Thursday, 27 September 2018 09:34:18 EEST Souptick Joarder wr=
ote:
> > > >>>>> On Tue, Sep 18, 2018 at 10:05 PM Souptick Joarder wrote:
> > > >>>>>> convert drm_atomic_helper_suspend/resume() to use
> > > >>>>>> drm_mode_config_helper_suspend/resume().
> > > >>>>>>
> > > >>>>>> remove suspend_state field from the rcar_du_device
> > > >>>>>> structure as it is no more required.
> > > >>>>>>
> > > >>>>>> With this conversion, also drm_fbdev_cma_set_suspend_unlocked(=
)
> > > >>>>>> will left with no consumer. So this function can be removed.
> > > >>>>>>
> > > >>>>>> Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
> > > >>>>> Laurent, any comment on this patch ??
> > > >>>> Sorry for the delay, and thanks for pinging me.
> > > >>>>
> > > >>>> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com=
>
> > > >>>>
> > > >>>> Should I apply this to my tree or do you plan to merge it throug=
h
> > > >>>> drm-misc
> > > >>>> as it touches drm_fb_cma_helper.c ?
> > > >>> I just realized that the same patch got supplied by Noralf Tr=C3=
=B8nnes nearly
> > > >>> a
> > > >>> year ago, and was later superseded by
> > > >>> https://patchwork.freedesktop.org/patch/247861/. I think we shoul=
d thus
> > > >>> apply Noralf's patches instead (once he sends v4 out).
> > > >> I don't think Noralf is still actively working on this, he's busy =
with the
> > > >> fbdev emulation stuff. Probably better if you pick up one of the e=
xisting
> > > >> ones, than waiting another year or so :-)
> > > > Isn't https://patchwork.freedesktop.org/patch/247861/ part of the f=
bdev
> > > > emulation stuff ? That patch series is from less than a month ago, =
so I
> > > > thought it was actively developed.
> > > >
> > > > Let's ask him. Noralf, any comment ? :-)
> > >
> > > I see now that I've caused some confusion here.
> > >
> > > I did some refactoring of the fbdev stuff in the CMA helper last year=
.
> > > In the last series of that work there is this patch:
> > >
> > > [v3,07/11] drm/rcar-du: Use drm_mode_config_helper_suspend/resume()
> > > https://patchwork.freedesktop.org/patch/192414/
> > >
> > > During Christmas I got the idea that maybe it was possible to use a d=
umb
> > > buffer to do generic fbdev emulation. That work took me 6 months befo=
re a
> > > solution using a general internal DRM client was hammered out. By the
> > > time I started to convert drivers I had forgotten about that patch.
> > >
> > > When I wrote the patch (#247861) to convert rcar to the generic fbdev=
, I
> > > just bundled up the suspend/resume change with the fbdev conversion.
> > > Laurent and Sam commented on that bundling, so I said that I would sp=
lit
> > > it up in the next version.
> > >
> > > All that being said, I think that this patch should be applied and I'=
ll
> > > just rebase the rcar fbdev conversion patch on top of that.
> > > It's the easiest for me at least :-)
> > >
> > Any conclusion on this patch ? :-)
>
> Laurent should pick it up and apply to his rcar-du tree I think. We can
> also stuff it into drm-misc as a fallback.

Can we get this patch in queue for 4.20 ?

> -Daniel
>
> >
> > ers/gpu/drm/drm_fb_cma_helper.c   | 18 ------------------
> > > >>>>>>   drivers/gpu/drm/rcar-du/rcar_du_drv.c | 21 ++---------------=
----
> > > >>>>>>   drivers/gpu/drm/rcar-du/rcar_du_drv.h |  1 -
> > > >>>>>>   include/drm/drm_fb_cma_helper.h       |  2 --
> > > >>>>>>   4 files changed, 2 insertions(+), 40 deletions(-)
> > > >>>>>>
> > > >>>>>> diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c
> > > >>>>>> b/drivers/gpu/drm/drm_fb_cma_helper.c index 47e0e2f..96efc88 1=
00644
> > > >>>>>> --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> > > >>>>>> +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> > > >>>>>> @@ -224,21 +224,3 @@ void drm_fbdev_cma_hotplug_event(struct
> > > >>>>>> drm_fbdev_cma *fbdev_cma)
> > > >>>>>>
> > > >>>>>>                  drm_fb_helper_hotplug_event(&fbdev_cma->fb_he=
lper);
> > > >>>>>>
> > > >>>>>>   }
> > > >>>>>>   EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
> > > >>>>>>
> > > >>>>>> -
> > > >>>>>> -/**
> > > >>>>>> - * drm_fbdev_cma_set_suspend_unlocked - wrapper around
> > > >>>>>> - *
> > > >>>>>> drm_fb_helper_set_suspend_unlocked
> > > >>>>>> - * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
> > > >>>>>> - * @state: desired state, zero to resume, non-zero to suspend
> > > >>>>>> - *
> > > >>>>>> - * Calls drm_fb_helper_set_suspend, which is a wrapper around
> > > >>>>>> - * fb_set_suspend implemented by fbdev core.
> > > >>>>>> - */
> > > >>>>>> -void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma
> > > >>>>>> *fbdev_cma,
> > > >>>>>> -                                       bool state)
> > > >>>>>> -{
> > > >>>>>> -       if (fbdev_cma)
> > > >>>>>> -
> > > >>>>>> drm_fb_helper_set_suspend_unlocked(&fbdev_cma->fb_helper,
> > > >>>>>> -                                                  state);
> > > >>>>>> -}
> > > >>>>>> -EXPORT_SYMBOL(drm_fbdev_cma_set_suspend_unlocked);
> > > >>>>>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> > > >>>>>> b/drivers/gpu/drm/rcar-du/rcar_du_drv.c index 02aee6c..288220f=
 100644
> > > >>>>>> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> > > >>>>>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> > > >>>>>> @@ -357,32 +357,15 @@ static void rcar_du_lastclose(struct drm=
_device
> > > >>>>>> *dev)
> > > >>>>>>
> > > >>>>>>   static int rcar_du_pm_suspend(struct device *dev)
> > > >>>>>>   {
> > > >>>>>>
> > > >>>>>>          struct rcar_du_device *rcdu =3D dev_get_drvdata(dev);
> > > >>>>>>
> > > >>>>>> -       struct drm_atomic_state *state;
> > > >>>>>>
> > > >>>>>> -       drm_kms_helper_poll_disable(rcdu->ddev);
> > > >>>>>> -       drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, true);
> > > >>>>>> -
> > > >>>>>> -       state =3D drm_atomic_helper_suspend(rcdu->ddev);
> > > >>>>>> -       if (IS_ERR(state)) {
> > > >>>>>> -               drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev=
,
> > > >>>>>> false);
> > > >>>>>> -               drm_kms_helper_poll_enable(rcdu->ddev);
> > > >>>>>> -               return PTR_ERR(state);
> > > >>>>>> -       }
> > > >>>>>> -
> > > >>>>>> -       rcdu->suspend_state =3D state;
> > > >>>>>> -
> > > >>>>>> -       return 0;
> > > >>>>>> +       return drm_mode_config_helper_suspend(rcdu->ddev);
> > > >>>>>>
> > > >>>>>>   }
> > > >>>>>>
> > > >>>>>>   static int rcar_du_pm_resume(struct device *dev)
> > > >>>>>>   {
> > > >>>>>>
> > > >>>>>>          struct rcar_du_device *rcdu =3D dev_get_drvdata(dev);
> > > >>>>>>
> > > >>>>>> -       drm_atomic_helper_resume(rcdu->ddev, rcdu->suspend_sta=
te);
> > > >>>>>> -       drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, false)=
;
> > > >>>>>> -       drm_kms_helper_poll_enable(rcdu->ddev);
> > > >>>>>> -
> > > >>>>>> -       return 0;
> > > >>>>>> +       return drm_mode_config_helper_resume(rcdu->ddev);
> > > >>>>>>
> > > >>>>>>   }
> > > >>>>>>   #endif
> > > >>>>>>
> > > >>>>>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> > > >>>>>> b/drivers/gpu/drm/rcar-du/rcar_du_drv.h index b3a25e8..ff25c8d=
 100644
> > > >>>>>> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> > > >>>>>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> > > >>>>>> @@ -78,7 +78,6 @@ struct rcar_du_device {
> > > >>>>>>
> > > >>>>>>          struct drm_device *ddev;
> > > >>>>>>          struct drm_fbdev_cma *fbdev;
> > > >>>>>>
> > > >>>>>> -       struct drm_atomic_state *suspend_state;
> > > >>>>>>
> > > >>>>>>          struct rcar_du_crtc crtcs[RCAR_DU_MAX_CRTCS];
> > > >>>>>>          unsigned int num_crtcs;
> > > >>>>>>
> > > >>>>>> diff --git a/include/drm/drm_fb_cma_helper.h
> > > >>>>>> b/include/drm/drm_fb_cma_helper.h index 4a65f0d..8dbbe1e 10064=
4
> > > >>>>>> --- a/include/drm/drm_fb_cma_helper.h
> > > >>>>>> +++ b/include/drm/drm_fb_cma_helper.h
> > > >>>>>> @@ -26,8 +26,6 @@ struct drm_fbdev_cma *drm_fbdev_cma_init(str=
uct
> > > >>>>>> drm_device *dev,
> > > >>>>>>
> > > >>>>>>   void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_=
cma);
> > > >>>>>>   void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev=
_cma);
> > > >>>>>>
> > > >>>>>> -void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma
> > > >>>>>> *fbdev_cma,
> > > >>>>>> -                                       bool state);
> > > >>>>>>
> > > >>>>>>   struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct
> > > >>>>>>   drm_framebuffer *fb,
> > > >>>>>>
> > > >>>>>>          unsigned int plane);
> > >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch